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drm/i915: handle non-flip pending case when unpinning the scanout buffer

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The first page flip queued will replace the current front buffer, which
should have a 0 pending flip count.  So at finish time we need to handle
that case (i.e. if the flip count is 0 *or* dec_and_test is 0 we need to
wake the waiters).

Also fix up an error path in the queue function and add some debug
output (only enabled with driver debugging).

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Jesse Barnes 2010-01-14 13:18:02 -08:00 committed by Eric Anholt
parent 8a6c77d645
commit de3f440f8c
1 changed files with 18 additions and 2 deletions
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20
drivers/gpu/drm/i915/intel_display.c
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@ -3985,6 +3985,12 @@ void intel_finish_page_flip(struct drm_device *dev, int pipe)
spin_lock_irqsave(&dev->event_lock, flags);
work = intel_crtc->unpin_work;
if (work == NULL || !work->pending) {
if (work && !work->pending) {
obj_priv = work->obj->driver_private;
DRM_DEBUG_DRIVER("flip finish: %p (%d) not pending?\n",
obj_priv,
atomic_read(&obj_priv->pending_flip));
}
spin_unlock_irqrestore(&dev->event_lock, flags);
return;
}
@ -4006,7 +4012,10 @@ void intel_finish_page_flip(struct drm_device *dev, int pipe)
spin_unlock_irqrestore(&dev->event_lock, flags);
obj_priv = work->obj->driver_private;
if (atomic_dec_and_test(&obj_priv->pending_flip))
/* Initial scanout buffer will have a 0 pending flip count */
if ((atomic_read(&obj_priv->pending_flip) == 0) ||
atomic_dec_and_test(&obj_priv->pending_flip))
DRM_WAKEUP(&dev_priv->pending_flip_queue);
schedule_work(&work->work);
}
@ -4019,8 +4028,11 @@ void intel_prepare_page_flip(struct drm_device *dev, int plane)
unsigned long flags;
spin_lock_irqsave(&dev->event_lock, flags);
if (intel_crtc->unpin_work)
if (intel_crtc->unpin_work) {
intel_crtc->unpin_work->pending = 1;
} else {
DRM_DEBUG_DRIVER("preparing flip with no unpin work?\n");
}
spin_unlock_irqrestore(&dev->event_lock, flags);
}
@ -4054,6 +4066,7 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
/* We borrow the event spin lock for protecting unpin_work */
spin_lock_irqsave(&dev->event_lock, flags);
if (intel_crtc->unpin_work) {
DRM_DEBUG_DRIVER("flip queue: crtc already busy\n");
spin_unlock_irqrestore(&dev->event_lock, flags);
kfree(work);
mutex_unlock(&dev->struct_mutex);
@ -4067,7 +4080,10 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
ret = intel_pin_and_fence_fb_obj(dev, obj);
if (ret != 0) {
DRM_DEBUG_DRIVER("flip queue: %p pin & fence failed\n",
obj->driver_private);
kfree(work);
intel_crtc->unpin_work = NULL;
mutex_unlock(&dev->struct_mutex);
return ret;
}